EP1594600B1 - Tickler for slurry reactors and tanks and method of using the same - Google Patents

Tickler for slurry reactors and tanks and method of using the same Download PDF

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Publication number
EP1594600B1
EP1594600B1 EP04702942A EP04702942A EP1594600B1 EP 1594600 B1 EP1594600 B1 EP 1594600B1 EP 04702942 A EP04702942 A EP 04702942A EP 04702942 A EP04702942 A EP 04702942A EP 1594600 B1 EP1594600 B1 EP 1594600B1
Authority
EP
European Patent Office
Prior art keywords
impeller
blades
tickler
tank
curved
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP04702942A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1594600A1 (en
Inventor
Kishore Kar
Richard F. Cope
Steven P. Sandor
Angela Pennington
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dow Global Technologies LLC
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Dow Global Technologies LLC
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Filing date
Publication date
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Publication of EP1594600A1 publication Critical patent/EP1594600A1/en
Application granted granted Critical
Publication of EP1594600B1 publication Critical patent/EP1594600B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/02—Maintaining the aggregation state of the mixed materials
    • B01F23/023—Preventing sedimentation, conglomeration or agglomeration of solid ingredients during or after mixing by maintaining mixed ingredients in movement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/50—Mixing liquids with solids
    • B01F23/53—Mixing liquids with solids using driven stirrers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/112—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades
    • B01F27/1123—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades sickle-shaped, i.e. curved in at least one direction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F2215/00—Auxiliary or complementary information in relation with mixing
    • B01F2215/04—Technical information in relation with mixing
    • B01F2215/0413—Numerical information
    • B01F2215/0418—Geometrical information
    • B01F2215/0422—Numerical values of angles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F2215/00—Auxiliary or complementary information in relation with mixing
    • B01F2215/04—Technical information in relation with mixing
    • B01F2215/0413—Numerical information
    • B01F2215/0418—Geometrical information
    • B01F2215/0427—Numerical distance values, e.g. separation, position
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F2215/00—Auxiliary or complementary information in relation with mixing
    • B01F2215/04—Technical information in relation with mixing
    • B01F2215/0413—Numerical information
    • B01F2215/0418—Geometrical information
    • B01F2215/0431—Numerical size values, e.g. diameter of a hole or conduit, area, volume, length, width, or ratios thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F2215/00—Auxiliary or complementary information in relation with mixing
    • B01F2215/04—Technical information in relation with mixing
    • B01F2215/0413—Numerical information
    • B01F2215/0436—Operational information
    • B01F2215/0463—Numerical power values
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F2215/00—Auxiliary or complementary information in relation with mixing
    • B01F2215/04—Technical information in relation with mixing
    • B01F2215/0413—Numerical information
    • B01F2215/0436—Operational information
    • B01F2215/0477—Numerical time values
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/051—Stirrers characterised by their elements, materials or mechanical properties
    • B01F27/053—Stirrers characterised by their elements, materials or mechanical properties characterised by their materials
    • B01F27/0531—Stirrers characterised by their elements, materials or mechanical properties characterised by their materials with particular surface characteristics, e.g. coated or rough

Definitions

  • the present invention relates to a tickler impeller and agitation system for use in slurry reactors and storage tanks. More specifically, the tickler impeller includes blades that are curved, angled upward and pitched in a manner effective for providing an toward and downward swirl in a slurry medium in the tank, which directs solids suspended in the slurry towards the bottom and center of the tank during slurry drainage.
  • tickler impeller as part of the agitation system.
  • the tickler impeller is mounted on an agitator shaft and located at close proximity to the tank bottom.
  • the purpose of the tickler is to keep the solids suspended and eliminate settling of the solids at the bottom of the tank.
  • Ticklers are normally pitch blade turbines (PBTs) or flat blade turbines (FBTs), see Figures 1 and 2 , respectively.
  • the tickler In relation to a main impeller, which agitates solids in a liquid medium, the tickler is a smaller agitator located in a spaced relation below the main impeller. While draining the tank, particularly after the slurry level has receded below a main impeller, efficiency of the tickler for solids suspension is critical to avoid solids deposition, pump starvation, and choking of the flow due to plugging of the pump suction line.
  • PBT and FBT ticklers function near the bottom of the tank as radial impellers which tend to throw the slurry out towards the wall of the tank, i.e. away from the central nozzle or drain.
  • US-A-2794628 discloses a propeller agitator for dispersion of materials and which is capable of both cutting or slicing and agitating the material to be mixed.
  • the propeller agitator is composed of two like blades on a hub to which a shaft is coupled for rotating the agitator.
  • the blades are pitched so as to propel the material in which the agitator rotates. For example the material may be moved in a downward direction away from the shaft although by reversing the pitch, movement in a direction upward of the shaft can be obtained.
  • the leading edge portions of the blade may be recessed to accommodate a hard cutting edge material and may be sharpened if desired.
  • This invention provides a mixing impeller system, in accordance with claim 1, comprising a container, at least one impeller, at least one tickler impeller, and a vertically disposed shaft located in the container, the at least one impeller and one tickler impeller being mounted on the shaft, the tickler impeller mounted below the at least one impeller, the tickler impeller comprising at least two generally crescent shaped curved blades mounted on the shaft for rotation in a container having a bottom, the curved blades having lowest edges and a line tangent to such lowest edges extending at an angle which is at least parallel to the bottom of the container when placed in the container, the curved blades having an average pitch from the vertical of from 75° or less whereby each of the blades has a concave face which faces downwardly at least at one angle towards the bottom of the container when placed in the container, and each concave face which leads when the shaft is rotated in the direction of intended rotation of the tickler impeller, the angle from the horizontal, the angle of the face and the curvature creating an
  • the invention also provides a method for draining a tank in accordance with claim 7, the method comprising rotating a tickler impeller in the tank, the tickler impeller comprising at least two curved tickler blades mounted below a mixing impeller on a vertical shaft for rotation in the tank, the curved tickler blades extending upwardly at an angle from the horizontal of from 0° to less than 90°, the tickler blades having a concave face which faces downwardly towards the bottom of the tank, the concave face leading when the shaft is rotated in the direction of rotation of the tickler impeller, the concave face curvingly facing downward from the end toward the shaft to the end of the tickler blade opposite the shaft, the angle from the horizontal; and creating an inward swirl towards a bottom of the tank when the tickler impeller is rotated.
  • tickler impeller when mounted on a vertical shaft is effective for providing an inward and downward swirl in a slurry medium which directs solids suspended in the slurry towards the bottom of the tank and towards the shaft on which the impeller is mounted. Directing solids suspended in a slurry downwards and towards the center of the tank rather than pushing those solids away from the center reduces solid deposits on the bottom and side of the tank, facilitates draining of the tank, and reduces nozzle plugging and pump starvation.
  • the angle of the blade from the horizontal, blade curvature and the angle of the face of the blade or blade pitch of the tickler impeller of the present invention are effective for directing solids suspended in a slurry downwards and towards the center of the tank which improves impeller drainage efficiency.
  • the blade pitch is also beneficial in reducing impeller drag and power number.
  • the tickler impeller of the present invention improves impeller drainage efficiency (1) by reducing the amount of material left as a heel in the bottom of an emptied tank and (2) by providing a faster drain time.
  • the tickler impeller of the invention is effective for decreasing drain time and heel mass compared to a downward pumping PBT impeller of the same size rotating at the same specific power level in the same suspension.
  • the geometry and shape of the tickler impeller of the invention is such that if the tickler impeller was standardized in size and environment so that it had an 27.9 cm (11 inch) diameter and was used in a 76.2 cm (30 inch) diameter tank having a cone-shaped bottom at a 75° angle from the vertical centreline, the tickler impeller would be effective for reducing the amount of suspension left in the tank at least by 10 percent (%), and generally by 25 to 90% compared to a downward pumping 0.28 m ((11 inch) (in ”)) diameter PBT tickler impeller in the same system; and would be effective for decreasing drain time by at least 10%, and generally by 30 to 45% compared to a downward pumping 0.28 m (11'') diameter PBT tickler impeller in the same system.
  • the blades of the tickler impeller are mounted on a hub for axial rotation on a shaft, which shaft is generally perpendicular to the horizontal, for mixing the contents of the tank or container.
  • the tickler impeller of the present invention includes at least two and up to twelve curved blades which are rounded at their ends or tips opposite to the hub.
  • the tickler impeller has three to four blades.
  • the rounded blade tips are effective for lessening tip shear.
  • the edges of the blades may be rounded.
  • a rounded upper edge of the blade which extends from the hub and shaft to the rounded end or tip and is effective for diminishing tickler impeller interference in a flow pattern of the main impeller which distributes solids throughout the tank.
  • a rounded lower edge of the blade opposite the upper edge extends from the hub and shaft to the rounded end or tip and is effective for reducing the amount of radial character that the impeller gives the slurry as its level recedes below the blade tip. More inward and downward flow is imparted to the slurry liquid as the level of the suspension in the tank recedes.
  • blades which have rounded edges may be glass coated for some mixing/reaction applications.
  • the curved blades of the tickler impeller are mounted to a vertical shaft, preferably at equal distances from one another. This provides balance to the blade and uniformity in the imparted hydraulic force.
  • the blades extend over the bottom of the tank and are at angle from the horizontal that is equal to or greater than an angle of the tank bottom.
  • the blades are upwardly angled to match the shape or angle of the bottom (typically conical in storage tanks) such that a line tangent to the lower edge of each blade is parallel to the tank bottom.
  • the blades extend upward from the horizontal at an angle of from 0° to less than a vertical 90°, preferably from 0° to 75° from horizontal, and preferably are angled upwardly 15° in a 15° coned-bottom tank.
  • Angled blades are especially important in tanks having conical or cone shaped bottoms as angling of blades is effective to allow placement of the blades as close as possible to the tank bottom.
  • the blades may be from 1.3 x 10 -2 to 0.1 m (1/2 to 4 inches) from the bottom of the tank (depending on the sizes of the particles and the tank).
  • the blades of the tickler impeller of the present invention are curved to create a cupped surface in the liquid being stirred that opens in the direction of the rotation of the blades. Rotating in this direction means that the tickler impeller is rotated such that the concave side of the blade leads and the convex side trails.
  • Each of the curved blades has a radius of the curved surface of from 0.1 to 10x the diameter of the tickler impeller. It also should be recognized that it is preferable that the blades have a smooth curvature, but that the curve of the blades could be obtained in increments or facets.
  • the rotating blades of the tickler impeller direct solids suspended in a slurry downwards and towards the center of the tank.
  • the curved faces of the blades of the tickler impeller have an average pitch or angle from the vertical of from 75° or less, in an important aspect an average pitch of 30° to 60°, and in a very important aspect an average pitch of 45°.
  • the pitch over the length of the blade may vary from 10° to 90°, preferable 45°.
  • the ratio of blade height to the impeller diameter is 0.05 to 0.75 and in an important aspect is 0.2.
  • curved blade and blade curvature mean that the blade as viewed from the top has a generally crescent shape with the concave side of the crescent facing the direction of intended rotation of the blade and the convex side of the blade trailing the concave side of the blade when the blade is rotated.
  • the radius of the curved surface of the blades is labeled in Figure 3 as 2.
  • the angle of the blades from the horizontal means the angle at which the tangent line of the bottom edge of the blade is from the horizontal such that the rotating blades do not interfere with or contact the bottom of a container or tank which may be horizontal angled or curved to form a cone-like or curved bottom. This angle is illustrated in Figure 4 as 102.
  • the pitch of the blade means the angle of the face of the blade from a vertical axis as seen as 4 in Figure 5b .
  • the tickler impeller 10 of the present invention is shown in Figure 3 .
  • the tickler impeller 10 may include three curved blades 20 which are mounted on a hub 30.
  • the hub 30 includes a shaft collar 32, set screw 34 and shaft opening 35 which allow the tickler impeller 10 to be mounted and attached to a shaft (such as a shaft 120 shown in Figure 4 ).
  • the hub 30 includes a shaft opening 35 that allows the tickler impeller 10 to be positioned on a shaft, such as for example shaft 120 shown in Figure 4 .
  • the shaft opening 35 may be fitted with a removable shaft collar 32 (shown in Figure 3 ).
  • the hub 30 includes blade receiving indentations 140 which are spaced are equal distances around the hub 30 and which are effective for receiving the curved blades 20.
  • the hub 30 is secured to a shaft with at least one set screw 34 which is positioned in a set screw opening 150 as seen in Figure 6a .
  • the blades may be mounted on the hub, and the hub may be mounted on the shaft by set screws, keys, shear pins or may be integrated onto the hub such as a welded, molded or cast part.
  • the curved blades 20 of the tickler impeller 10 rotate in the direction of the curvature such that a concave side 70 of the curved blade 20 leads and a convex side 80 trails as shown by arrow 22 in Figure 3 .
  • the curved blades 20 may include rounded ends or tips 40 and an upper edge 50 and a lower edge 60 which are rounded.
  • a tickler impeller 10 in a reactor tank 100 is illustrated in Figure 4 .
  • the tickler impeller 10 is located below a main impeller 110 and is mounted on the same shaft 120 as a second impeller 110.
  • the reactor tank 100 has a conical shaped bottom 130 and the curved blades 20 of the tickler impeller 10 are parallel to the conical shaped bottom 130.
  • the above impeller is located generally on the tangent line 140, which is the line perpendicular from the vertical sides 142, of the tank at a point where the vertical side joins the angled base 146, of the conical bottom 130 of the tank.
  • the tickler impeller generally is located below the tangent line.
  • the blade can be made of any material that is compatible with the contents of the tank, such as non-reactive plastic or stainless steel.
  • tickler impellers Three different types were installed below dual 0.38m ((15 inches) (in or ")) (outside diameter (OD) 4-blade PBTs in a 0.76m (30") OD Plexiglass mixing tank.
  • the three tickler impellers were as follows.
  • the tank was filled to a depth of approximately 0.41m (16") above the tangent line with a 40 weight percent slurry of Saran TM polyvinylidene chloride resin beads in water.
  • the impeller rotation rate was set so that 0.38m (15") PBTs, in combination with each tickler type, required the same amount of motor torque ((2.9N ⁇ m) (26.1 in-lb)) N ⁇ m).
  • the tank was drained. The draining procedure was recorded on a digital video camera, while total draining time and pounds of resin heel left in the tank bottom were measured. Test results were as follows.
  • the Sauter mean particle diameter is 350x10 -6 m (350 ⁇ ) and the suspension density is 1.4g/cc.
  • Heel (grams) 1 8.5 510 91 2 7.75 465 727 3 5.0 300 45
  • the Sauter mean particle diameter is 350x10 -6 m (350 ⁇ ) and the suspension density is 1.4g/cc, but is different from Resin A in that the particles are surface coated to cause agglomeration.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
EP04702942A 2003-01-24 2004-01-16 Tickler for slurry reactors and tanks and method of using the same Expired - Lifetime EP1594600B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US10/350,786 US6955461B2 (en) 2003-01-24 2003-01-24 Tickler for slurry reactors and tanks
US350786 2003-01-24
PCT/US2004/001117 WO2004067159A1 (en) 2003-01-24 2004-01-16 Tickler for slurry reactors and tanks

Publications (2)

Publication Number Publication Date
EP1594600A1 EP1594600A1 (en) 2005-11-16
EP1594600B1 true EP1594600B1 (en) 2009-12-09

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EP04702942A Expired - Lifetime EP1594600B1 (en) 2003-01-24 2004-01-16 Tickler for slurry reactors and tanks and method of using the same

Country Status (9)

Country Link
US (1) US6955461B2 (zh)
EP (1) EP1594600B1 (zh)
CN (1) CN1741843B (zh)
AT (1) ATE451168T1 (zh)
CA (1) CA2512804A1 (zh)
DE (1) DE602004024501D1 (zh)
MX (1) MXPA05007867A (zh)
RU (1) RU2338585C2 (zh)
WO (1) WO2004067159A1 (zh)

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CA2512804A1 (en) 2004-08-12
ATE451168T1 (de) 2009-12-15
WO2004067159A1 (en) 2004-08-12
US6955461B2 (en) 2005-10-18
MXPA05007867A (es) 2007-11-21
CN1741843B (zh) 2013-10-16
RU2338585C2 (ru) 2008-11-20
US20040145966A1 (en) 2004-07-29
EP1594600A1 (en) 2005-11-16
RU2005126730A (ru) 2006-01-27
CN1741843A (zh) 2006-03-01
DE602004024501D1 (de) 2010-01-21

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